Reuse values of Qsys generics in C++ app

[Altera_Forum]

Hi, 

 when generating a Qsys system, a sopcinfo file is generated. This file can be used to created C/C++ headers containing a lot of macro definitions like base addresses, etc. What it is apparently missing are the values of generics. E.g. I would like to use the HPS user clock frequency in my C++ app without maintaining its value manually. I'm aware that the generic values are included in the sopcinfo file, so I could probably write a script to extract the desired values. But maybe there is an automatic way to do this already?

[Altera_Forum]

Perhaps the "sopc-generate-header-files" is the utility that you are looking for? It is installed with SoC EDS.

[Altera_Forum]

I use this utility to generate headers. However, these headers do not include the values of generics. But I should check the parameters of the tool, maybe there is an option to include them.

[Altera_Forum]

Hm, no, I don't see a option to include the generics.

[Altera_Forum]

I think the only way to transmit those kind of parameters to the C/C++ app is through a custom component. Please note that this example is quite old, I'm still working on a design with Quartus 11 and SOPC builder, but I think it should still apply to QSys and HPS designs. 

All those lines need to be put in the component's *_hw.tcl file  The component needs a custom elaboration callback set_module_property ELABORATION_CALLBACK elaboration_proc  Create a generic parameter for the component that takes a clock frequency as value add_parameter CLOCK_FREQ Integer set_parameter_property CLOCK_FREQ SYSTEM_INFO { CLOCK_RATE clock } set_parameter_property CLOCK_FREQ VISIBLE False set_parameter_property CLOCK_FREQ AFFECTS_ELABORATION True set_parameter_property CLOCK_FREQ AFFECTS_GENERATION False  For that property to work you need a clock input port with the "clock" name # +----------------------------------- # | connection point clock # | add_interface clock clock end set_interface_property clock clockRate 0 set_interface_property clock ENABLED true add_interface_port clock csi_sys_Clk clk Input 1  And then in the elaboration procedure you can transmit the value to the software layer # custom elaboration procedure proc elaboration_proc { } { set_module_assignment embeddedsw.CMacro.CLOCK_FREQ }  It's probably overkill if you don't already have a custom component with custom driver but it's the only way I know, other than parsing the sopcinfo file yourself.